register_callback('smd_short_url', 'txp_die', 404);

function smd_short_url($event, $step) {
	$urlparts = parse_url(hu);

	// Probably better regexes for this using [\d] etc
	$re = '#^'.$urlparts['path'].'([0-9].*)#';

	$have_id = preg_match($re, $_SERVER['REQUEST_URI'], $m);

	if ($have_id) {
		$id = $m[1];
		$permlink = permlinkurl_id($id);
		if ($permlink) {
			ob_end_clean();
			header("HTTP/1.0 301 Moved Permanently");
			header("Location: $permlink");
			die();
		}
	}
}

function smd_canonical($atts, $thing='') {
	global $pretext;

	extract(lAtts(array(
		'type' => 'link',
	), $atts));

	assert_article();
	$link = hu.$pretext['id'];

	$out = '';
	if ($type=="link") {
		$out = '<link rev="canonical" href="'.$link.'" />';
	} else {
		$out = $link;
	}
	return $out;
}